| Technical parameter | Parameter value | 
| CO2 range | 0~5000ppm | 
| CO2 accuracy | ±100ppm | 
| Communication Interface | RS485 | 
| Default baud rate | 9600 8 n 1 | 
| Power | DC9~24V 1A | 
| Display | LCD | 
| Running temperature | -40~80°C | 
| Working humidity | 5%RH~90%RH | 
BRAND: SONBEST
TYPE: KD97B70
Email: sale@sonbest.com
WeChat: 13918126020
SKYPE: SOOBUU
Phone: +86-021-66862075
QQ1: 71182854 QQ2:613035997